<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
<div id="app">
    <button @click="fn">切换显示隐藏</button>
    <h1 v-show="isShow">黑马程序员</h1>
</div>
<script src="./vue.js"></script>
<script>
    const app = new Vue({
        el: '#app',
        data: {
            isShow: false
        },
        methods: {
            fn() {
                // 让提供的所有 methods 函数，this 都指向当前实例
                console.log("fn执行了...")
                this.isShow = !this.isShow
            }
        }
    })
</script>
</body>
</html>